A comprehensive review on mixotrophic denitrification processes for biological nitrogen removal

Zhang, Jintao; Fan, Chunzhen; Zhao, Min; Wang, Zhiquan; Jiang, Shunfeng; Jin, Zhan; Bei, Ke; Zheng, Xiangyong; Wu, Suqing; Lin, Pei; Miu, Huanyi

doi:10.1016/j.chemosphere.2022.137474

Cited by 54 publications

(6 citation statements)

References 80 publications

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“…2 and 3 ; Table 3 ). TH94 showed the gene set for mixotrophic denitrification, a growth strategy in which heterotrophic denitrification and sulfur-based autotrophic denitrification may occur simultaneously [ 98 – 100 ]. TH94 showed the genes required for thiosulfate oxidation ( sox ), sulfite oxidation ( dsr , apr , qmo ) and sulfide oxidation ( sqr ) using nitrate reduction ( nap AB) or nitrite reduction ( nir S, nir BD) as its electron acceptors, and the genes involved in carbon fixation by Calvin cycle (with flux predicted), indicating that CO2 could be the sole carbon source [ 85 , 98 , 101 ].…”

Section: Resultsmentioning

confidence: 99%

Living in mangroves: a syntrophic scenario unveiling a resourceful microbiome

Laux,

Ciapina,

de Carvalho

et al. 2024

BMC Microbiol

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Background Mangroves are complex and dynamic coastal ecosystems under frequent fluctuations in physicochemical conditions related to the tidal regime. The frequent variation in organic matter concentration, nutrients, and oxygen availability, among other factors, drives the microbial community composition, favoring syntrophic populations harboring a rich and diverse, stress-driven metabolism. Mangroves are known for their carbon sequestration capability, and their complex and integrated metabolic activity is essential to global biogeochemical cycling. Here, we present a metabolic reconstruction based on the genomic functional capability and flux profile between sympatric MAGs co-assembled from a tropical restored mangrove. Results Eleven MAGs were assigned to six Bacteria phyla, all distantly related to the available reference genomes. The metabolic reconstruction showed several potential coupling points and shortcuts between complementary routes and predicted syntrophic interactions. Two metabolic scenarios were drawn: a heterotrophic scenario with plenty of carbon sources and an autotrophic scenario with limited carbon sources or under inhibitory conditions. The sulfur cycle was dominant over methane and the major pathways identified were acetate oxidation coupled to sulfate reduction, heterotrophic acetogenesis coupled to carbohydrate catabolism, ethanol production and carbon fixation. Interestingly, several gene sets and metabolic routes similar to those described for wastewater and organic effluent treatment processes were identified. Conclusion The mangrove microbial community metabolic reconstruction reflected the flexibility required to survive in fluctuating environments as the microhabitats created by the tidal regime in mangrove sediments. The metabolic components related to wastewater and organic effluent treatment processes identified strongly suggest that mangrove microbial communities could represent a resourceful microbial model for biotechnological applications that occur naturally in the environment.

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Section: Resultsmentioning

confidence: 99%

Living in mangroves: a syntrophic scenario unveiling a resourceful microbiome

Laux,

Ciapina,

de Carvalho

et al. 2024

BMC Microbiol

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“…Microorganisms play vital role in the nitrogen removal process [44]. Based on this fact, the community analysis was carried out for the microorganisms in the simulated and actual wastewater, and the corresponding results are shown in Figures 8 and 9.…”

Section: Microbiological Analysismentioning

confidence: 99%

Fabrication of a Sulfur/Steel Slag-Based Filter and Its Application in the Denitrification of Nitrate-Containing Wastewater

Hou,

Zhu,

Tang

et al. 2024

Water

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To solve the problems of deep nitrogen removal in wastewater treatment plants and the high value utilization of steel slag in the metallurgical industry, this work aims to prepare a sulfur/steel slag-based filter using the melting method. The melt granulation method and the utilization of metallurgical waste were the main innovations of this work. On this basis, the nitrogen removal performance of the filter media in simulated wastewater and actual wastewater were systematically investigated. Furthermore, the factors affecting the nitrogen removal performance of the filter media were studied, and pilot experiments were carried out. The microbial community in the reactor was also analyzed. The results showed that when the mass ratio of sulfur and steel slag was 9:1, the filter media could remove up to 90% of TN in simulated wastewater at room temperature, with a hydraulic retention time (HRT) of 5–20 h and an influent TN of 21 mg/L. In the simulated wastewater, the effluent NO3−-N was less than 2 mg/L, the SO42− was less than 200 mg/L, and the pH was between 6 and 8. The removal of TN from actual wastewater was also greater than 90% at room temperature under a hydraulic retention time (HRT) of 8–20 h and an influent TN of 8 mg/L. Influence factor experiments were conducted at room temperature, with a C/N of 2:1, a DO of 0.9–1 mg/L, and an HRT of 4 h. The results of the pilot experiment confirmed that the effluent TN was stable below 10 mg/L. The filter media was compounded for practical engineering applications. Microbial community analysis showed that the sulfur autotrophic denitrifying bacterial species Thiobacillus accounted for 3.69% and 5.55% of the simulated and actual wastewater systems, respectively. This work provides a novel strategy for the application of solid metallurgical waste in the field of nitrate-containing wastewater treatment.

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“…In the process of nitrite removal, the use of denitrifying bacteria is recommended as an environmentally friendly method. 19 Enzymes such as nitrite reductase, nitrite oxide reductase, and nitrous oxide reductase in denitrifying bacteria can stimulate the conversion of the water-soluble nitrite compound to gaseous forms (NO, N 2 O, or N 2 ), thus completely removing the nitrite pollutant from the aqueous environment. 20 Studies showed that the biofilm-forming characteristic of bacteria is the formation of an extracellular polymer layer, which can protect them from the negative effects of the external environment.…”

Section: Introductionmentioning

confidence: 99%

Multilayer immobilizing of denitrifying Bacillus sp. and TiO₂–AgNPs on floating expanded clay carrier for co-treatment of nitrite and pathogens in aquaculture

Hoang,

Nguyen,

Phan

et al. 2024

RSC Adv.

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A comprehensive review on mixotrophic denitrification processes for biological nitrogen removal

Cited by 54 publications

References 80 publications

Living in mangroves: a syntrophic scenario unveiling a resourceful microbiome

Living in mangroves: a syntrophic scenario unveiling a resourceful microbiome

Fabrication of a Sulfur/Steel Slag-Based Filter and Its Application in the Denitrification of Nitrate-Containing Wastewater

Multilayer immobilizing of denitrifying Bacillus sp. and TiO₂–AgNPs on floating expanded clay carrier for co-treatment of nitrite and pathogens in aquaculture

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A comprehensive review on mixotrophic denitrification processes for biological nitrogen removal

Cited by 54 publications

References 80 publications

Living in mangroves: a syntrophic scenario unveiling a resourceful microbiome

Living in mangroves: a syntrophic scenario unveiling a resourceful microbiome

Fabrication of a Sulfur/Steel Slag-Based Filter and Its Application in the Denitrification of Nitrate-Containing Wastewater

Multilayer immobilizing of denitrifying Bacillus sp. and TiO2–AgNPs on floating expanded clay carrier for co-treatment of nitrite and pathogens in aquaculture

Contact Info

Product

Resources

About

Multilayer immobilizing of denitrifying Bacillus sp. and TiO₂–AgNPs on floating expanded clay carrier for co-treatment of nitrite and pathogens in aquaculture